Brettomomyces
LHBS Curmudgeon
Not really...the precursor of DMS is halved every 40 minutes of a boil...so you have removed more than 75% of the SMM. You really shouldn't see it.
Right, that's what I'm thinking as well. I'm not personally worried, just thinking this could be a good example because it's on the extreme end and I have not seen anyone else go that long with a heated, covered stand.
Edit - I did read through that beer smith article that goes into a lot of detail, just the section on cooling confused me at first, because it mentions forming an increased 30% of DMS per hour while hot. So basically, I've taken the DMS level down to 20% or so during the boil, and then that is being increased to 23% the first hour and then 26% the second?